M5lp 1109 5 0 Throttle Body Test Big Deal 016

Under the lid you'll find it's a nicely detailed plastic piece with a inset red rubber gasket and a small circuit board. Just about in the center of the circuit board is a black square; it's the Hall Effect proximity sensor for the magnet on the end of the throttle shaft. Luckily the sensor and throttle shaft relationship are automatically set by the cover and throttle body housing architecture, so there is nothing to worry about during assembly.